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s390/mm,ptdump: make page table dumping seq_file optional 

s390 version of ae5d1cf358 ("arm64: dump: Make the page table
dumping seq_file optional").

Tested-by: Vasily Gorbik <gor@linux.ibm.com>
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
This commit is contained in:
Heiko Carstens 2020-09-09 11:14:52 +02:00 committed by Vasily Gorbik
parent 6c6687a444
commit 6bf9a639e7
1 changed files with 26 additions and 10 deletions
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36
arch/s390/mm/dump_pagetables.c
View File

@ -51,18 +51,34 @@ struct pg_state {
const struct addr_marker *marker;
};
#define pt_dump_seq_printf(m, fmt, args...) \
({ \
struct seq_file *__m = (m); \
\
if (__m) \
seq_printf(__m, fmt, ##args); \
})
#define pt_dump_seq_puts(m, fmt) \
({ \
struct seq_file *__m = (m); \
\
if (__m) \
seq_printf(__m, fmt); \
})
static void print_prot(struct seq_file *m, unsigned int pr, int level)
{
static const char * const level_name[] =
{ "ASCE", "PGD", "PUD", "PMD", "PTE" };
seq_printf(m, "%s ", level_name[level]);
pt_dump_seq_printf(m, "%s ", level_name[level]);
if (pr & _PAGE_INVALID) {
seq_printf(m, "I\n");
pt_dump_seq_printf(m, "I\n");
return;
}
seq_puts(m, (pr & _PAGE_PROTECT) ? "RO " : "RW ");
seq_puts(m, (pr & _PAGE_NOEXEC) ? "NX\n" : "X\n");
pt_dump_seq_puts(m, (pr & _PAGE_PROTECT) ? "RO " : "RW ");
pt_dump_seq_puts(m, (pr & _PAGE_NOEXEC) ? "NX\n" : "X\n");
}
static void note_page(struct ptdump_state *pt_st, unsigned long addr, int level, u64 val)
@ -87,25 +103,25 @@ static void note_page(struct ptdump_state *pt_st, unsigned long addr, int level,
if (level == -1)
addr = max_addr;
if (st->level == -1) {
seq_printf(m, "---[ %s ]---\n", st->marker->name);
pt_dump_seq_printf(m, "---[ %s ]---\n", st->marker->name);
st->start_address = addr;
st->current_prot = prot;
st->level = level;
} else if (prot != st->current_prot || level != st->level ||
addr >= st->marker[1].start_address) {
seq_printf(m, "0x%0*lx-0x%0*lx ",
width, st->start_address,
width, addr);
pt_dump_seq_printf(m, "0x%0*lx-0x%0*lx ",
width, st->start_address,
width, addr);
delta = (addr - st->start_address) >> 10;
while (!(delta & 0x3ff) && unit[1]) {
delta >>= 10;
unit++;
}
seq_printf(m, "%9lu%c ", delta, *unit);
pt_dump_seq_printf(m, "%9lu%c ", delta, *unit);
print_prot(m, st->current_prot, st->level);
while (addr >= st->marker[1].start_address) {
st->marker++;
seq_printf(m, "---[ %s ]---\n", st->marker->name);
pt_dump_seq_printf(m, "---[ %s ]---\n", st->marker->name);
}
st->start_address = addr;
st->current_prot = prot;